CVE-2026-68450btrfs: free mapping node on duplicate reloc root insert
- —Not scoredno CVSS score yet
- 0.16%Exploitation in 30 daysEPSS · top 95% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: free mapping node on duplicate reloc root insert __add_reloc_root() allocates a mapping_node before inserting it into rc->reloc_root_tree. If rb_simple_insert() finds an existing entry, it returns the existing rb_node and leaves the newly allocated node unlinked. The error path then returns -EEXIST without freeing the new node. Since the node was never inserted into reloc_root_tree, the later cleanup in put_reloc_control() cannot find it either. Free the newly allocated node before returning -EEXIST. The callers currently assert that -EEXIST should not happen, so this is a defensive cleanup for an unexpected duplicate insert path. If the path is ever reached, the local allocation should still be released.
Timeline
ID reserved
By Linux
- 13 days later
· 13 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.16% · top 95% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 57a304cfd43b2b4a5b44b8f5dc026abb34183068 – < 29d9746812d8b7c37d594f484e994fd552c3ec33
- affected 57a304cfd43b2b4a5b44b8f5dc026abb34183068 – < b7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8
- affected 57a304cfd43b2b4a5b44b8f5dc026abb34183068 – < 92bedc0455552b42ada1a1f42b0e3a8593cdfccc
- affected 57a304cfd43b2b4a5b44b8f5dc026abb34183068 – < 14a8be9428435ee17f17fae7991215c246b7fd43
- affected 57a304cfd43b2b4a5b44b8f5dc026abb34183068 – < 797dc567146c7e3c4f8d9680e4fbc76e0a6d9151
- affected 57a304cfd43b2b4a5b44b8f5dc026abb34183068 – < ae0629ff9ccb836416ada129f4edc7efea6eaaad
- affected 57a304cfd43b2b4a5b44b8f5dc026abb34183068 – < 6a8269b6459ed870a8156c106a0f597383907872
- affected 5.13
- unaffected < 5.13
- unaffected 5.15.216 – ≤ 5.15.*
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.148 – ≤ 6.6.*
- unaffected 6.12.101 – ≤ 6.12.*
- unaffected 6.18.42 – ≤ 6.18.*
- unaffected 7.1.6 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References7
- https://git.kernel.org/stable/c/29d9746812d8b7c37d594f484e994fd552c3ec33 (opens in a new tab)
- https://git.kernel.org/stable/c/b7c5b8e1d5f0779dfbabc3068b7ac0f12e53b3a8 (opens in a new tab)
- https://git.kernel.org/stable/c/92bedc0455552b42ada1a1f42b0e3a8593cdfccc (opens in a new tab)
- https://git.kernel.org/stable/c/14a8be9428435ee17f17fae7991215c246b7fd43 (opens in a new tab)
- https://git.kernel.org/stable/c/797dc567146c7e3c4f8d9680e4fbc76e0a6d9151 (opens in a new tab)
- https://git.kernel.org/stable/c/ae0629ff9ccb836416ada129f4edc7efea6eaaad (opens in a new tab)
- https://git.kernel.org/stable/c/6a8269b6459ed870a8156c106a0f597383907872 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-57056 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-68450)Record last updated .